O-Ring 72x4 NBR - Nitrile Rubber Sealing Ring

Main Description

The O-Ring 72x4 NBR 70 ShA is a standard industrial rubber sealing ring designed for reliable static sealing in a wide range of hydraulic and pneumatic applications. Manufactured from high-quality NBR (nitrile rubber) with a hardness of 70 ShA, this O-ring provides an excellent balance between elasticity, compression resistance, and long-term sealing performance. It is one of the most commonly used technical sealing components in machinery, equipment, and fluid power systems worldwide.

NBR compounds are valued for their strong oil and fuel resistance, making this O-ring suitable for contact with mineral oils, lubricants, hydraulic fluids, and many process media used in industrial environments. Its high durability and consistent dimensional stability make it a dependable choice for maintenance engineers, service technicians, and OEM manufacturers seeking a universal and cost-effective sealing solution.

With internal diameter 72 mm and cross-section 4 mm, this O-Ring supports a wide range of static sealing tasks, including flange connections, threaded systems, housings, valves, and low-pressure fittings. Its material properties ensure reliable operation in typical industrial temperature ranges while maintaining performance under compression without cracking or permanent deformation.

This NBR O-Ring is suitable for:
• Hydraulics and pneumatics
• General industrial sealing applications
• Machine construction and repair
• Automotive systems and fluid transfer components
• Static sealing points in pumps, cylinders, manifolds, and housings

It is a versatile and widely used rubber gasket offering strong sealing efficiency, mechanical resilience, and compatibility with standard groove dimensions.

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FAQ

Q: What is the temperature range for NBR O-Rings?
A: Standard NBR 70 ShA typically operates between approx. -30°C and +100°C, depending on the medium and application.

Q: Is NBR suitable for oil-based systems?
A: Yes. NBR is one of the best materials for mineral oils, lubricants, fats, and many hydraulic fluids.

Q: Where is this O-Ring most commonly used?
A: It is widely applied in hydraulic and pneumatic cylinders, valves, connectors, pumps, and various industrial machines.

Q: Is this O-Ring intended for static or dynamic sealing?
A: Primarily for static sealing. For dynamic motion, consult requirements for higher wear-resistant materials.

Q: Can NBR O-Rings be used with high-pressure systems?
A: Yes, if installed in properly designed grooves. For extreme pressure, backup rings may be required.